Azo dyestuff and process of making same



Patented June 27, 1933 UNITED STATES PATENT OFFICE JOSEPH G-YR, or BASEL, SWITZERLAND, AssIe-Non TO socrnry or CHEMICAL innos'rn IN BASLE, or, BASEL, SWITZERLAND .AZO DYESTUFF AND PROCESS OF MAKING SAME No Drawing. Application filed February 23, 1933, Serial No. 658,243, and in Switzerland March 2,1932.

It is known chat, generally speaking, the direct-dyeing dyestutls can be used for dyeing artificial silk made from regenerated cellulose. An obstacle to their general use, however, is the known fact that many of these dyestuffs produce so-called stripy dyeings on piece goods. This is particularly the case with the most important of the blue direct-dyeing azo-dyestufis of the benzidine series, the dyestufi from 1 mol. tetrazotized 1: 4=-diamino-3 3'-dimethoxy--diphenyl and 2 mol. 1amino-8-hydroxynaphthalene-2-: 1- disulfonic acid (alkaline coupling).

According to the present invention new dyestuffs are produced which have the valuable property of dyeing viscose silk piecegoods pure greenishto reddish-blue tints. The value of the new dyestuffs lies in the combination of the purity of the shade with the excellent uniformity of the dyeings on so-called stripy viscose. The new dyestuffs are obtained by uniting tetrazotized 414:- diamino-diphenylene, for example tetrazotized 4:4l-diamino-diphenyl or a derivative thereof substituted in 3 3-position by alkyl or alkoXy-groups, such as 4 4-diamino-3 3- dimethoxy-diphenyl, under alkaline conditions with 1 mol. l-hydroxynaphthalenel: 8- disulfonic acid and 1 mol. of such a sulfonic acid of a l-amino-8-hydr0xynaphthalene which couples with diazo-compounds in the 7 -position.

The sodium salts of the new dyestuffs correspond to the general formula OH NH:

OH SOZNB l SQsNa wherein one of the ys stands for an SO Nagroup and the other two ys stand for hydrogen or an sO Na-group, a" and e for hydrogen'or an sO Na-group, wherein further the sum of the sulfonic groups marked by the letters at, y and a does not exceed the figure 2,

and wherein no sulfonic group stands in orthoor peri-position to the other, and finally wherein the two ws stand for two hydrogen atoms or for two alkylor alkoxy-groups.

The new dyestuiis constitute in a dry state black powders which dissolve in water to blue solutions and dye viscose silk greenishto reddish-blue tints which are destinguished by their purity" combined with an excellent uniformity.

The following examples illustrate the invention.

Example 1 The tetrazo-compound prepared in ordinary manner from 2 M parts by weight of 3 3 dimethoxy i 4 diamino diphenyl is coupled ina solution rendered alkaline with sodium-carbonate with 239 parts by weight of 1 amino 8 hydroxynaphthalene-e-sulfonic acid, and, after the coupling is complete, withBOl parts by weight of l-hydronynaphthalene-: S-disultonic acid. The dyestufi' thus obtained is then isolated by heating and salting out, filtered and dried. It constitutes a dark powder which dissolves in water to a pure blue solution. or artificial fibers from regenerated, cellulose it yields pure blue tints," particularly valuable dyeings being obtained on viscose silk. The formula. ofthe new dyestuii in the form pf its sodium salts is very probably as folows:

SQaNa I on some QCHa i SOaNa Example 2 10 kilos of artificial silk are wetted and rinsed in water of -7 0 0.; at the same time a dye-bath is prepared by dissolving 0.1 kilo of the dyestuif from 1 mol. tetrazotized l: 4- diamino 3 3 dimethoxy diphenyl and 1 mol. 1 hydroxynaphthalene 4: S-disulfonic On cotton.

acid and 1 mol. 1-amino-8-hydroxynaphthalene-3 6-disulfonic acid in 100 litres of boiling water. The formula of the above dyestufi' in the form of its sodium salt is very probably H |O If H:

NaOaS SOsNa H O SOsNa I S OaNa When dissolution is complete there is added so much water that a dye-bath of 350 litres at 4050 C. is finally obtained. The

wet-ted viscose silk is entered into this bath at the said temperature. The bath is heated gradually to 8085 C. and after dyeing has continued for 1, hour, 2-3 kilos of crystallized sodium sulphate are added and dyeing is further continued for 1 hour at 8085 C. The goods are then rinsed and dried. The viscose silk is dyed even greenish-blue tints.

The following table illustrates further dyestufi's which can be produced by this invention:--

Tetrazotizing 1st coupling 2nd coupling 32x 3 component component component Silk 4:4-'dlamino -3:3- 1 hydroxynaph- 1 amino 8 Blue dimethyl-diphethalene 4:8 hydroxy-naphnyl disulfonic acid thalene 4 sullonic acid 4:4 -dlamlno- 3:3- l-hydroxynaph- 1 amino 8 Greem'shdimethoxydiphe thalene 4:8 hydroxy-naphue nyl disulfom'c acid thalene 2:4

disulfonic acid 4:4-diazm'no-3:3- 'l-hYdIOXYIlflDll-l l amino 8 Greemshdimethyldi -phethalene 4:8 hydroxynaphblue nyl disulfonic acid thalene 2:4 i disullonic acid What I claim is 1. Process for the production of new dyestufis, consisting in coupling one molecular proportion of a tetra-zotized diphenyl of the general formula wherein the two ws stand for hydrogen, alkyl or alkoxy-groups, in an alkaline medium with one molecular proportion of l-hydroxynaphthalene 4 8 disulfonic acid, and one molecular proportion of such a sulfonic acid of 1-amino-8-hydroxynaphthalene which couples in. the 7-position with diazo-compounds. 9 r v 2. Process for the production of a new azo-dyestufi', consisting in coupling one molecular proportion of tetrazotized dianisidine in an alkaline medium with one molecular proportion of 1-hydroXynaphthalenel: 8-disulfonic acid and one molecular pro portion of l-amino-8-hydroxynaphthalene- 3 6-disulfonic acid.

3. Process for the production of a new azo-dyestufi, consisting in coupling one molecular proportion of tetra-Zotized dianisidine in an alkaline medium with one molecular proportion of I-hydroxy'naphthalene- 4:8-disulfonic acid and one molecular proportion of l-amino-hydroXynaphthalene-4- sulfonic acid.

4. The new dyestuffs formula of the general HO NH:

wherein one of the ys stands for'an SO Nagroup and the other two ys stand for hydrogen or an sO Na-group, m and z for hy- 5. The new'a'zo-dye'stufi whose sodium salt very probably corresponds with the formula HO N,'H2

OCHs

NaOaS- SOBNS HO soaNa SO Na which product constitutes a black powder which dissolves in water to a green-blue solution, dyes cotton green-blue tints, and Viscose silk greenish-blue tints which are dis tinguished by their purity combined with an excellent uniformity.

6. The new aZo-dyestuff whose sodium salt very probably corresponds with the formula HO NH:

OCH:

SOaNa HO SO3Na CH3 I SOQNB 

